Fix incorrect URLs to Showcase examples

[ChristopherRabotin]

I have updated all GitHub URLs in the Showcase documentation to point to the correct location in the repository. Following a recent restructuring, the examples/ directory is now located under nyx-core/examples/. I performed a comprehensive search and replace across the docs/ directory to ensure all tree/master/examples/ and blob/master/examples/ links were updated to tree/master/nyx-core/examples/ and blob/master/nyx-core/examples/ respectively. I verified the changes by building the documentation and confirming the links in the generated HTML.

Fixes #48

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PR created automatically by Jules for task 12794409445085745864 started by @ChristopherRabotin

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[gemini-code-assist]

Code Review

This pull request updates several documentation files under docs/nyxspace/showcase/ to correct the GitHub repository URLs pointing to the example code. The paths have been updated to include the nyx-core/ directory, aligning with the restructured repository layout. I have no feedback to provide as there are no review comments.

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